If it is a factory glass, I would first make sure the glass date code is correct for your car. If it is or even if it isn't the glass can be buffed. It is pretty much the same procedure as buffing paint on your cars body. I would stress to the person buffing it the the date code be not buffed. It will come off. Even if it is the wrong date code for your car I would keep the date code. You may want to get rid of the glass in the future. You never know. Without the date code it is just a piece of glass.